linux-kernel - Re: [PATCH 01/11] fs: add O_BENEATH

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Message-ID: <CAD=T17FQEZV+iy91wQAvAdd0PW2tsfjpU7atp-xeatm5sEGz5Q@mail.gmail.com>
Date:	Tue, 8 Jul 2014 13:48:27 +0100
From:	Meredydd Luff <meredydd@...atehouse.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Andy Lutomirski <luto@...capital.net>,
	David Drysdale <drysdale@...gle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	LSM List <linux-security-module@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	James Morris <james.l.morris@...cle.com>,
	Kees Cook <keescook@...omium.org>,
	Linux API <linux-api@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-man@...r.kernel.org
Subject: Re: [PATCH 01/11] fs: add O_BENEATH_ONLY flag to openat(2)

On 8 July 2014 13:07, Christoph Hellwig <hch@...radead.org> wrote:
> There's two different AT_* namespaces.  The flags that most *at syscalls
> has, and the the one for the dfd argument, which currently only contains
> AT_FDCWD, although a new constant has recently been proposed to it.
>
> Having an AT_BENEATH magic value for the dfd argument certainly feels
> elegant to me

How would that work? The directory beneath which openat is looking is
conveyed in the dfd argument itself. If I'm understanding this right,
you'd have to pass a different value for "open relative to fd#5" and
"open relative to fd#5, but beneath it only", which doesn't sound
hugely elegant to me.

Meredydd
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